I'm trying to get a Diablo 1 game starting, because I want to play a multiplayer game with my brother (either over Hamachi or standard wrapped IPX..there's a guide out there). I don't have the graphical color glitch issue anymore (because installed the official fix by Blizzard) and I installed the Diablo v1.09 patch , but the game looks like this:

So the whole game (Blizzard intro, starting screen, in-game screen) is in fullscreen mode, but it's very small.